#ifndef __AVGDIFFTRACKER_H
#define __AVGDIFFTRACKER_H

#include "Common.h"

#define AVG_DIFF_COUNT 500

class AvgDiffTracker
{
public:
	AvgDiffTracker() : total(0), index(0), average(0) { memset(&tab, 0, sizeof(tab)); max[0] = 0; max[1] = 0; }

	uint32 getAverage()
	{
		return average;
	}

	uint32 getTimeWeightedAverage()
	{
		if (tab[AVG_DIFF_COUNT-1] == 0)
			return 0;

		uint32 sum = 0, weightsum = 0;
		for (uint32 i=0; i<AVG_DIFF_COUNT; ++i)
		{
			sum += tab[i]*tab[i];
			weightsum += tab[i];
		}
		return sum/weightsum;
	}

	uint32 getMax()
	{
		return max[0] > max[1] ? max[0] : max[1];
	}

	void Update(uint32 diff)
	{
		if (diff < 1)
			diff = 1;
		total -= tab[index];
		total += diff;
		tab[index] = diff;
		if (diff > max[0])
			max[0] = diff;
		if (++index >= AVG_DIFF_COUNT)
		{
			index = 0;
			max[1] = max[0];
			max[0] = 0;
		}

		if (tab[AVG_DIFF_COUNT-1])
			average = total/AVG_DIFF_COUNT;
		else if (index)
			average = total/index;
		else
			average = 0;
	}

private:
	uint32 tab[AVG_DIFF_COUNT];
	uint32 total;
	uint32 index;
	uint32 max[2];
	uint32 average;
};

extern AvgDiffTracker avgDiffTracker;
extern AvgDiffTracker lfgDiffTracker;
extern AvgDiffTracker devDiffTracker;

#endif
